Display device

ABSTRACT

A display device is provided. The display device includes a substrate having a first edge and a second edge opposite to the first edge. There is a first distance between the first edge and the second edge. The display device also includes a plurality of light-emitting units disposed on the substrate, and a conductive line disposed on the substrate and electrically connected to at least one of the plurality of light-emitting units. The conductive line includes an undulating edge and has an extending length which is greater than or equal to half of the first distance and is less than or equal to the first distance.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of provisional application no. U.S.Patent Application No. 62/500,539 filed on May 3, 2017, the entirety ofwhich is incorporated by reference herein.

BACKGROUND Technical Field

The disclosure relates to display devices, and in particular to displaydevices including light-emitting diodes.

Description of the Related Art

As digital technology develops, display devices are becoming more widelyused in our society. For example, display devices have been applied inmodern information and communication devices such as televisions,notebook computers, desktop computers, mobile phones (e.g.,smartphones). In addition, each generation of display devices has beendeveloped to be thinner, lighter, smaller, and more fashionable.

Among the various types of display devices, light-emitting diode (LED)display devices are becoming popular due to the advantages of LEDs whichinclude high efficiency and long lifespans.

However, existing LED display devices have not been satisfactory inevery respect. For example, the conductive line or conductive electrodemay be easily cracked during the formation of a curved display device).

BRIEF SUMMARY

Some embodiments of the disclosure provide a display device. The displaydevice includes a substrate having a first edge and a second edgeopposite to the first edge, wherein there is a first distance betweenthe first edge and the second edge; a plurality of light-emitting unitsdisposed on the substrate; and a conductive line disposed on thesubstrate and electrically connected to at least one of the plurality oflight-emitting units, wherein the conductive line includes an undulatingedge, wherein the conductive line has an extending length, and whereinthe extending length is greater than or equal to half of the firstdistance and is less than or equal to the first distance.

Some embodiments of the disclosure provide a display device. The displaydevice includes a substrate; a plurality of light-emitting unitsdisposed on the substrate; and a conductive line disposed on thesubstrate and electrically connected to at least one of the plurality oflight-emitting units, wherein the conductive line includes a pluralityof openings.

A detailed description is given in the following embodiments withreference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood from the following detaileddescription when read with the accompanying figures. It is worth notingthat in accordance with standard practice in the industry, variousfeatures are not drawn to scale. In fact, the dimensions of the variousfeatures may be arbitrarily increased or reduced for clarity ofdiscussion.

FIG. 1A is a schematic side view of the curved display device 10according to some embodiments of the present disclosure.

FIG. 1B is a schematic side view of the curved display device 10′according to some embodiments of the present disclosure.

FIG. 2A is a schematic top view of the display device 20 according toFirst Embodiment of the present disclosure.

FIG. 2B is a schematic top view of a portion of the display region 202of the display device 20 according to some embodiments of the presentdisclosure.

FIG. 2C is a schematic top view of a portion of the display region 202of the display device 20 according to some embodiments of the presentdisclosure.

FIG. 2D is a schematic top view of a portion of the display region 202of the display device 20 according to some embodiments of the presentdisclosure.

FIG. 2E is a schematic top view of a portion of the display region 202of the display device 20 according to some embodiments of the presentdisclosure.

FIG. 2F is a schematic top view of a portion of the conductive line 208according to some embodiments of the present disclosure.

FIG. 2G is a schematic top view of a portion of the conductive line 208according to some embodiments of the present disclosure.

FIG. 2H is a schematic top view of the display device 20 according tosome embodiments of the present disclosure.

FIG. 2I is a schematic top view of the display device 20 according tosome embodiments of the present disclosure.

FIG. 2J is a schematic top view of the display device 20 according tosome embodiments of the present disclosure.

FIG. 3A is a schematic top view of a portion of the display region 202of the display device 30 according to Second Embodiment of the presentdisclosure.

FIG. 3B is a schematic top view of a portion of the display region 202of the display device 30 according to some embodiments of the presentdisclosure.

FIG. 3C is a schematic top view of a portion of the display region 202of the display device 30 according to some embodiments of the presentdisclosure.

FIG. 3D is a schematic top view of a portion of the conductive electrode210 according to some embodiments of the present disclosure.

FIG. 3E is a schematic top view of a portion of the conductive electrode210 according to some embodiments of the present disclosure.

FIG. 4A is a schematic cross-sectional view of the display device 40according to some embodiments of the present disclosure.

FIG. 4B is a schematic cross-sectional view of the display device 40according to some embodiments of the present disclosure.

FIG. 4C is a schematic cross-sectional view of the display device 40according to some embodiments of the present disclosure.

FIG. 5 is a schematic cross-sectional view of the display device 50according to Third Embodiment of the present disclosure.

FIG. 6A is a schematic side view of the display device 60 according toFourth Embodiment of the present disclosure.

FIG. 6B is a schematic side view of the display device 70 according toan embodiment of the present disclosure.

FIG. 7A is a schematic top view of the display device 80 according toFifth Embodiment of the present disclosure.

FIG. 7B is a schematic top view of the display device 80 according tosome embodiments of the present disclosure.

FIG. 7C is a schematic top view of the display device 80 according tosome embodiments of the present disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, orexamples, for implementing different features of the subject matterprovided. Specific examples of components and arrangements are describedbelow to simplify the present disclosure. These are, of course, merelyexamples and are not intended to be limiting. For example, the formationof a first feature over or on a second feature in the description thatfollows may include embodiments in which the first and second featuresare formed in direct contact, and may also include embodiments in whichadditional features may be formed between the first and second features,such that the first and second features may not be in direct contact. Inaddition, the present disclosure may repeat reference numerals and/orletters in the various embodiments. This repetition is for simplicityand clarity and does not in itself dictate a relationship between thevarious embodiments and/or configurations discussed.

Some embodiments are described below. Throughout the various views andillustrative embodiments, like reference numbers are used to designatelike features. It should be understood that additional operations can beprovided before, during, and after the method, and some of theoperations described can be replaced or eliminated for other embodimentsof the method.

FIG. 1A is a schematic side view of the curved display device 10according to some embodiments of the present disclosure. As shown inFIG. 1A, the curved display device 10 includes one or more curvedportions 100. For example, the curved portions 100 can include the endportions of the display device 10. In some embodiments, the curvedportions 100 (e.g., two curved portions 100) are symmetrical withrespect to the center line C of the curved display device 10 as shown inFIG. 1A.

FIG. 1B is a schematic side view of another curved display device 10′according to embodiments of the present disclosure. As shown in FIG. 1B,the curved display device 10′ can have curved portion 100′ including thecenter portion of the display device 10′.

It should be noted that the curved display devices (e.g., curved displaydevice 10 or curved display device 10′) of some embodiments of thepresent disclosure can be foldable display devices. However, in otherembodiments, the shape of the curved display device is substantiallyfixed.

First Embodiment

First Embodiment of the present disclosure provides some display deviceswhich can be used to form curved display devices. The conductive linesof the display devices of First Embodiment may have a wavy shape and/orinclude one or more openings, which may avoid or reduce the formation ofcracks in the step of using these display devices to form curved displaydevices.

FIG. 2A is a schematic top view of the display device 20 according toFirst Embodiment of the present disclosure. The display device 20 can beused to form a curved display device (e.g., a curved display device witha side view the same as, or similar to the curved display devices 10 or10′ discussed above). For example, the display device 20 can be bent toform a curved display device.

As shown in FIG. 2A, the display device 20 can include a display region202 and a non-display region 204 adjacent to the display region 202. Forexample, the non-display region 204 can surround or enclose the displayregion 202, as shown in FIG. 2A. The display region 202 can refer to thedisplay region in the display device 20 in which the light-emittingunits (e.g., light-emitting diodes) are disposed. On the other hand, thenon-display region 204 refers to a region other than the display region202 in the display device 20. For example, an integrated circuit (IC), ademultiplexer (DEMUX), a gate driver on panel (GOP), other applicabledevices or components, or a combination thereof may be disposed in thenon-display region 204. For example, the devices or components disposedin the non-display region 204 may be electrically connected to thelight-emitting units (e.g., light-emitting diodes) disposed in thedisplay region 202 to provide some desired functions (e.g., providingdriving signal to the light-emitting units disposed in the displayregion 202).

As shown in FIG. 2A, the display device 20 includes a substrate 200having a first edge 200 a and a second edge 200 b opposite to the firstedge 200 a. In some embodiments, the first edge 200 a and the secondedge 200 b are substantially parallel to each other and are spaced apartby a first distance D₁ (e.g., 5 cm to 10 cm). For example, the substrate200 of the display device 20 may include polyimide, glass, otherapplicable materials, or a combination thereof. It should be noted thatthe elements of the display device 20 formed on the substrate 200 arenot shown in FIG. 2A, and will be discussed in the following paragraph.

Then, referring to FIG. 2B, a schematic top view of a portion of thedisplay region 202 of the display device 20 is illustrated. As shown inFIG. 2B, the display region 202 can include a plurality oflight-emitting units 206 (e.g., light-emitting diodes), one or moreconductive lines 208, and one or more conductive electrodes 210.

In this embodiment, a sub-pixel 212 has two light-emitting units 206(e.g., light-emitting diodes). However, the sub-pixel 212 may have lessor more than two light-emitting units 206 with the same color in otherembodiments. In some embodiments, adjacent sub-pixels 212 (e.g., threesub-pixels 212) can form a pixel. For example, the pixel can includesub-pixels 212 containing light-emitting units 206 of different colors(e.g., red, green, blue, or a combination thereof).

For example, the material of the conductive electrodes 210 can include,but is not limited to, indium tin oxide (ITO), tin oxide (SnO), indiumzinc oxide (IZO), indium gallium zinc oxide (IGZO), indium tin zincoxide (ITZO), antimony tin oxide (ATO), antimony zinc oxide (AZO),metal, or a combination thereof. For example, the material of theconductive lines 208 can include, but is not limited to, indium tinoxide (ITO), tin oxide (SnO), indium zinc oxide (IZO), indium galliumzinc oxide (IGZO), indium tin zinc oxide (ITZO), antimony tin oxide(ATO), antimony zinc oxide (AZO), metal, or a combination thereof. Forexample, the conductive electrodes 210 and the conductive lines 208 maybe respectively formed by a deposition process followed by a lithographyprocess and an etching process.

In some embodiments, the conductive line 208 can be a common line, theconductive electrode 210 can be a common electrode, and the conductiveline 208 can be electrically connected to at least one of thelight-emitting units 206 through the conductive electrode 210.

In some embodiments, the one or more conductive electrodes 210 can bedisposed on the one or more conductive lines 208 and the plurality oflight-emitting units 206. In other words, the one or more conductivelines 208 and the plurality of light-emitting units 206 can be disposedbetween the substrate 200 and the one or more conductive electrodes 210.

In some embodiments, the conductive line 208 may have a wavy shape. Forexample, as shown in FIG. 2B, the conductive line 208 may include anundulating edge 208 a (e.g., an undulating edge extending along adirection substantially perpendicular to the first edge 200 a and/or thesecond edge 200 b of the substrate 200), and thus the formation ofcracks in the conductive line 208 during the step of forming a curveddisplay device (e.g., bending the display device 20 to form a curveddisplay device) may be avoided or reduced.

In some embodiments, as shown in FIG. 2B, the conductive line 208 canextend along a direction substantially perpendicular to the first edge200 a and/or the second edge 200 b of the substrate 200 (referring toFIG. 2A), and an extending length L₁ (e.g., a distance measured in adirection perpendicular to the first edge 200 a and/or the second edge200 b of the substrate 200) of the conductive line 208 can be greaterthan or equal to half of the first distance D₁ and be less than or equalto the first distance D₁ (i.e., 0.5 D₁≤L₁≤D₁). In some embodiments,since the extending length L₁ is greater than or equal to half of thefirst distance D₁ and less than or equal to the first distance D₁, abetter device performance can be obtained.

FIGS. 2C, 2D, 2E, 2F, and 2G illustrate some conductive lines 208 ofsome embodiments of the present disclosure which also may avoid orreduce the formation of cracks during the step of forming a curveddisplay device.

Referring to FIG. 2C, one difference between the embodiments illustratedin FIG. 2C and FIG. 2B is that the conductive line 208 of theembodiments illustrated in FIG. 2C further includes one or more openings214. For example, a pattering process including a lithography processfollowed by an etching process may be used to form the one or moreopenings 214 in the conductive line 208. In some embodiments, theopening 214 may have a shape including a first curved portion 214 a(e.g., the round corners of the rectangular opening 214), and thus themechanical property of the conductive line 208 may be further improved.In other embodiments, the opening 214 may also be substantiallyoval-shaped (e.g., as shown in FIG. 2D), substantially square,substantially rectangular, substantially round, substantially oblong,substantially triangular, polygon, irregularly-shaped, other applicableshapes, or a combination thereof.

Referring to FIG. 2E, one difference between the embodiments illustratedin FIG. 2C and FIG. 2E is that the conductive line 208 of theembodiments illustrated in FIG. 2E includes a substantially straightedge 208 a (e.g., a straight edge extending along a directionsubstantially perpendicular to the first edge 200 a and/or the secondedge 200 b of the substrate 200). Notably, the opening 214 of theembodiments illustrated in FIG. 2E may also be substantiallyoval-shaped, substantially square, substantially rectangular,substantially round, substantially oblong, substantially triangular,polygon, irregularly-shaped, other applicable shapes, or a combinationthereof.

In some embodiments, as shown in FIGS. 2C, 2D, and 2E, the one or moreopenings 214 may be located between adjacent conductive electrodes 210.

In some embodiments, as shown in FIG. 2F, a single conductive line 208may include a plurality of openings 214 having different shapes or sizesto increase design flexibility.

In some embodiments, as shown in FIG. 2G, the conductive line 208 mayhave a partially undulating edge 208 a. For example, the edge 208 a ofthe conductive line 208 may include a substantially straight portion 208a′ and a wavy portion 208 a″, where the wavy portion is provided at weakpoints that are prone to cracking.

In some embodiments, the conductive lines 208 are common lines that canbe used to transmit common signals from an IC disposed in thenon-display region 204 of the display device 20 to the light-emittingunits 206 disposed in the display region 202 of the display device 20.For example, as shown in FIG. 2H, the common signals can be transmittedfrom an IC 216 into the display region 202 of the display device 20through the common lines 208 in a direction substantially perpendicularto the first edge 200 a and/or the second edge 200 b of the substrate200. As shown in FIG. 2H, the common lines 208 may be electricallyconnected to the IC 216 through another common line 218 disposed in thenon-display region 204 of the substrate 200. In some embodiments, thecommon line 218 may also have a wavy shape, and/or include a pluralityof openings as do the common lines 208 discussed above. In someembodiments, the common line 218 and the common lines 208 may bedisposed in different layers, and in such cases one or more vias may beused to electrically connect the common line 218 to the common lines208. In some embodiments, the common line 218 and the common lines 208may be disposed in the same layer, and the common line 218 and thecommon lines 208 may be formed by a same process (e.g., deposition,lithography, etching, other applicable processes, or a combinationthereof). As shown in FIG. 2H, a demultiplexer (DEMUX) 222′ electricallyconnected to the IC 216, and a gate driver on panel 222 electricallyconnected to the IC 216 may also be disposed in the non-display region204 of the display device 20. In addition, as shown in FIG. 2H, the IC216 may be electrically connected to a printed circuit board 220.

In some embodiments, as shown in FIG. 2I, the common signals can betransmitted from the IC 216 into the display region 202 of the displaydevice 20 through common lines 224 extending along a directionsubstantially parallel to the first edge 200 a and/or the second edge200 b of the substrate 200, and thus the common signals are transmittedinto the display region 202 of the display device 20 in the directionsubstantially parallel to the first edge 200 a and/or the second edge200 b. In some embodiments, the common lines 224 may also have a wavyshape, and/or include a plurality of openings as do the common lines 208discussed above.

In some embodiments, as shown in FIG. 2J, the common signals can betransmitted into the display region 202 of the display device 20 throughboth the common lines 208 extending along a direction that issubstantially perpendicular to the first edge 200 a and/or the secondedge 200 b of the substrate 200, and the common lines 224 extendingalong a direction that is substantially parallel to the first edge 200 aand/or the second edge 200 b of the substrate 200. In other words, thecommon signals can be transmitted into the display region 202 of thedisplay device 20 in two directions substantially perpendicular to eachother.

Understandably, FIGS. 2H, 2I, and 2J are schematic top views of somedisplay devices according to some embodiments of the present disclosure,and the elements illustrated in these FIGS. may be disposed in the samelayer or in different layers.

It should be noted that the curved display devices formed of the displaydevices of the above embodiments may include technical features whichare the same as or similar to the technical features of the displaydevices of the above embodiments. For example, the conductive lines maystill have a wavy shape and/or include one or more openings in thecurved display devices formed of the display devices of the aboveembodiments. These curved display devices are intended to be includedwithin the scope of the present disclosure.

Second Embodiment

FIG. 3A is a schematic top view of a portion of the display region 202of the display device 30 according to Second Embodiment of the presentdisclosure. One difference between Second Embodiment and the aboveembodiments is that the one or more conductive electrodes 210 (e.g., acommon electrode) may have a wavy shape and/or include one or moreopenings, which may avoid or reduce the formation of cracks in the oneor more conductive electrodes during the step of forming a curveddisplay device (e.g., bending the display device 30 to form a curveddisplay device).

As shown in FIG. 3A, the conductive electrode 210 may have a wavy shape.For example, as shown in FIG. 3A, the conductive electrode 210 mayinclude an undulating edge 210 a (e.g., an undulating edge extendingalong a direction substantially parallel to the first edge 200 a and/orthe second edge 200 b of the substrate 200).

In some embodiments, as shown in FIG. 3B, the conductive electrode 210may have one or more openings 302. For example, a pattering processincluding a lithography process followed by an etching process may beused to form the one or more openings 302 in the conductive electrode210. In some embodiments, the opening 302 may have a shape including afirst curved portion 302 a (e.g., the round corners of the rectangularopening 302), and thus the mechanical property of the conductiveelectrode 210 may be further improved. In other embodiments, the opening302 may also be substantially oval-shaped, substantially square,substantially rectangular, substantially round, substantially oblong,substantially triangular, polygon, irregularly-shaped, other applicableshape, or a combination thereof.

In some embodiments, as shown in FIG. 3B, the area of one of theopenings 302 is smaller than the area of one of the light-emitting units206 (e.g., the area of the bottom surface or top surface of one of thelight-emitting diodes 206), and thus the mechanical property of theconductive electrode 210 may be further improved.

In some embodiments, as shown in FIG. 3C, a single bulk conductiveelectrode 210 including a plurality of openings 302 can be provided. Inaddition, the single conductive electrode 210 may cover a plurality ofsub-pixels 212.

In some embodiments, as shown in FIGS. 3A, 3B, and 3C, thelight-emitting units 206 are fully covered by the conductive electrodes210.

FIGS. 3D and 3E illustrate some conductive electrodes 210 according tosome embodiments of the present disclosure which also may avoid orreduce the formation of cracks during the step of forming a curveddisplay device.

In some embodiments, as shown in FIG. 3D, a single conductive electrode210 may include a plurality of openings 302 having different shapes orsizes to increase design flexibility.

In some embodiments, as shown in FIG. 3E, the conductive electrode 210may have a partially undulating edge 210 a. For example, the edge 210 aof the conductive electrode 210 may include a substantially straightportion 210 a′ and a wavy portion 210 a″, where the wavy portion isprovided at weak points that are prone to cracking.

In some other embodiments, the design of the conductive electrodes 210(e.g., the wavy shape, and/or the opening therein) discussed above canbe applied to a common electrode, a touch electrode, other conductiveelectrodes, or a combination thereof of a display device. The detailswill be discussed in the following paragraph.

FIG. 4A is a schematic cross-sectional of the display device 40according to some embodiments of the present disclosure. The displaydevice 40 can be used to form a curved display device (e.g., a curveddisplay device with a side view the same as, or similar to the curveddisplay devices 10 or 10′ discussed above). For example, the displaydevice 40 can be bent to form a curved display device.

As shown in FIG. 4A, the display device 40 includes a substrate 400. Forexample, the substrate 400 can be made of glass, polyimide, otherapplicable materials, or a combination thereof. A buffer layer 402 maybe optionally formed on the substrate 400 to reduce the latticemismatch. For example, the buffer layer 402 can be made of siliconoxide, silicon nitride, other applicable materials, or a combinationthereof. A semiconductor layer 404 may be formed on the buffer layer402. For example, the semiconductor layer 404 may include one or moredoped regions 404 a which may serve as source/drain regions. A gateinsulator 406 may be formed on the semiconductor layer 404. For example,the gate insulator 406 may be made of silicon oxide, other applicablematerials, or a combination thereof. One or more gate electrodes 408 maybe formed on the gate insulator 406, and a first insulating layer 410(e.g., silicon oxide) may be formed on the one or more gate electrodes408. A second insulating layer 412 may be formed on the first insulatinglayer 410. For example, the second insulating layer 412 may be made of amaterial (e.g., silicon nitride) that is different from the material ofthe first insulating layer 410. A third insulating layer 414 may beformed on the second insulating layer 412. For example, the thirdinsulating layer 414 may be made of silicon nitride, organic materials(e.g., Acrylic based organic material), other applicable insulatingmaterials, or a combination thereof. A pixel defining layer (PDL) 416may be formed on the third insulating layer 414. For example, the pixeldefining layer 416 (e.g. an insulating layer) may be made ofphotosensitive polyimide, acrylic, siloxane, novolac materials, otherapplicable materials, or a combination thereof. A reflector 420 may beformed on the pixel defining layer 416. As shown in FIG. 4A, thereflector 420 may extend from a top surface of the pixel defining layer416 into the pixel defining layer 416 and the third insulating layer414. For example, the reflector 420 may be made of metal (e.g., Al orAg), metal alloys (e.g., metal alloys of Al or Ag), other applicablematerials, or a combination thereof. One or more light-emitting units424 (e.g., light-emitting diodes) may be formed on the reflector 420. Asshown in FIG. 4A, a filling material may be formed on the reflector 420and around the one or more light-emitting units 424. For example, thefilling material 422 may be made of organic material, anisotropicconductive film (ACF) bonding material, other applicable materials, or acombination thereof. In some embodiments, the filling material caninclude quantum dots therein. As shown in FIG. 4A, one or moreconductive lines 418 may be formed on the pixel defining layer 416. Forexample, the conductive lines 418 may also have a wavy shape and/orinclude one or more openings as do the conductive lines 208 discussedabove. As shown in FIG. 4A, the display device 40 may also include afourth insulating layer 426 formed on the conductive lines 418, thelight-emitting units 424, and the pixel defining layer 416. For example,the fourth insulating layer 426 may be made of an organic material,inorganic/organic stacked layer (e.g., SiNx/organic/SiNx stacked layer),other applicable insulating materials, or a combination thereof. Asshown in FIG. 4A, a conductive electrode 428 which may be configured toelectrically connect the conductive line 418 to the light-emitting unit424 may be formed on the conductive lines 418, the light-emitting units424, and the fourth insulating layer 426.

As shown in FIG. 4A, one or more conductive structures 434 may be formedin the display device 40 to electrically connect different elements ofthe display device 40.

In some embodiments, the conductive electrode 428 may include a commonelectrode, a touch electrode, or a combination thereof. As noted above,the design of the conductive electrodes 210 (e.g., the wavy shape,and/or the opening therein) discussed above can be applied to theconductive electrode 428 (e.g., a common electrode, a touch electrode,or a combination thereof), such that the formation of cracks during thestep of forming a curved display device may be avoided or reduced.

In some embodiments, a single bulk conductive electrode 428 maysimultaneously serve as a common electrode and a touch electrode, andthus the route for transmitting common signals and the route fortransmitting touch signals may be the same. However, in otherembodiments, as shown in FIG. 4B, two conductive electrodes 428 a and428 b may respectively serve as a touch electrode and a commonelectrode, and thus the route for transmitting touch signals and theroute for transmitting common signals may be different.

In some embodiments, the touch electrode and the common electrode may beformed in different layers. For example, as shown in FIG. 4C, one ormore touch electrodes 432 can be formed on the common electrode 428, andan insulating layer 430 may be formed between the one or more touchelectrodes 432 and the common electrode 428. In some embodiments, asshown in FIG. 4C, the one or more touch electrodes 432 and thelight-emitting units 424 do not overlap, and thus a better deviceperformance may be obtained.

Notably, more layers of conductive electrodes can be formed on theconductive electrode 428 according to, for example, the application ofthe display device. For example, more layers of touch electrodes can beformed on the common electrode 428 and the touch electrodes 432 of thedisplay device illustrated in FIG. 4C.

In some embodiments, as shown in FIG. 4A, the insulating layer under thelight-emitting units 424 (e.g., insulating layers 414) may include arecess or a trench 414 a therein, which may further reduce the formationof cracks in the display device during the step of forming a curveddisplay device.

It should be noted that the curved display devices formed of the displaydevices of the above embodiments may include technical features that arethe same as or similar to the technical features of the display devicesof the above embodiments. For example, the conductive electrodes maystill have a wavy shape and/or include one or more openings in thecurved display devices formed of the display devices of the aboveembodiments. These curved display devices are intended to be includedwithin the scope of the present disclosure.

Third Embodiment

FIG. 5 is a schematic cross-sectional of the display device 50 accordingto Third Embodiment of the present disclosure. The display device 50 canbe used to form a curved display device (e.g., a curved display devicewith a side view the same as, or similar to the curved display devices10 or 10′ discussed above). For example, the display device 50 can bebent to form a curved display device.

The display device 50 may be similar to the display devices of the aboveembodiments (e.g., the display device 40), and the difference betweenthe display device 50 and the display devices of the above embodimentswill be discussed in the following paragraph.

As shown in FIG. 5, the pixel defining layer 416 may include a firstportion 416 a overlapping with the conductive line 418, and a secondportion 416 b not overlapping with the conductive line 418. As shown inFIG. 5, the second portion 416 b of the pixel defining layer 416 isadjacent to the first portion 416 a of the pixel defining layer 416(e.g. an insulating layer). In some embodiments, a thickness T₁ of thefirst portion 416 a can be greater than a thickness T₂ of the secondportion 416 b (e.g., a minimum thickness of the second portion 416 b),which may improve the mechanical property of the display device 50(e.g., avoiding or reducing the formation of cracks in the displaydevice 50 during the step of bending the display device 50 to form acurved display device).

As shown in FIG. 5, the fourth insulating layer 426 may include a firstportion 426 a overlapping with the conductive electrode 428, and asecond portion 426 b not overlapping with the conductive electrode 428.As shown in FIG. 5, the second portion 426 b of the fourth insulatinglayer 426 is adjacent to the first portion 426 a of the fourthinsulating layer 426. In some embodiments, a thickness T₄ of the secondportion 426 b can be greater than a thickness T₃ of the first portion426 a (e.g., a minimum thickness of the first portion 426 a), which mayimprove the mechanical property of the display device 50 (e.g., avoidingor reducing the formation of cracks in the display device 50 during thestep of bending the display device 50 to form a curved display device).

It should be noted that the curved display devices formed of the displaydevices of the above embodiments may include technical features whichare the same as or similar to the technical features of the displaydevices of the above embodiments (e.g., the technical features of theinsulating layers discussed in paragraphs [0086] and [0087]). Thesecurved display devices are intended to be included within the scope ofthe present disclosure.

Fourth Embodiment

Fourth Embodiment of the present disclosure also provides some displaydevices which may avoid or reduce the formation of cracks in the step ofusing these display devices to form curved display devices.

Referring to FIG. 6A, a schematic side view of the display device 60according to Fourth Embodiment of the present disclosure is provided.Although only the substrate 200 and the light-emitting units (e.g.,light-emitting diodes) 206 a and 206 b are shown in FIG. 6A for theinterest of simplicity, one skilled in the art can understand thatadditional layers and/or components discussed in the above embodimentsmay also be disposed in the display device 60. For example, someinsulating layers may be formed between the substrate 200 and thelight-emitting units (206 a and 206 b) of the display device 60, and oneor more conductive electrodes may be formed on the light-emitting units206 a and 206 b.

For example, the display device 60 can be bent to form a curved displaydevice (e.g., curved display device 10′ shown in FIG. 1B). As shown inFIG. 6A, the display device 60 can include a portion 60 a and a portion60 b. For example, the portion 60 a can correspond to a curved portionof a curved display device (e.g., the curved portion 100′ of the curveddisplay device 10′ illustrated in FIG. 1B) formed of the display device60, and the portion 60 b can correspond to a non-curved portion of thecurved display device formed of the display device 60.

In some embodiments, the dimension of one of the light-emitting units206 a in the portion 60 a may be smaller than the dimension of one ofthe light-emitting units 206 b in the portion 60 b, which may avoid orreduce the formation of cracks in the step of using the display device60 to form a curved display device. For example, the bottom surface areaof one of the light-emitting units 206 a may be smaller than the bottomsurface area of one of the light-emitting units 206 b. In someembodiments, the ratio of the bottom surface area of one of thelight-emitting units 206 a to the bottom surface area of one of thelight-emitting units 206 b may be 0.3 to 0.95.

In some embodiments, as shown in FIG. 6A, the density (e.g., number oflight-emitting units per unit area) of the light-emitting units 206 a inthe portion 60 a may be smaller than the density of the light-emittingunits 206 b in the portion 60 b, which may avoid or reduce the formationof cracks in the step of using the display device 60 to form a curveddisplay device.

Referring to FIG. 6B, a schematic side view of the display device 70according to another embodiment of the present disclosure is provided.Similar to the display device 60, the display device 70 also includes aportion 70 a corresponding to the curved portion of the curved displaydevice (e.g., the curved portion 100 of the curved display device 10illustrated in FIG. 1A) formed of the display device 70, and a portion70 b corresponding to the non-curved portion of the curved displaydevice formed of the display device 70.

In some embodiments, the dimension of one of the light-emitting units206 a in the portion 70 a may be smaller than the dimension of one ofthe light-emitting units 206 b in the portion 70 b, which may avoid orreduce the formation of cracks in the step of using the display device70 to form a curved display device. For example, the bottom surface areaof one of the light-emitting units 206 a may be smaller than the bottomsurface area of one of the light-emitting units 206 b. In someembodiments, the ratio of the bottom surface area of one of thelight-emitting units 206 a to the bottom surface area of one of thelight-emitting units 206 b may be 0.3 to 0.95.

In some embodiments, as shown in FIG. 6B, the density (e.g., number oflight-emitting units per unit area) of the light-emitting units 206 a inportion 70 a may be smaller than the density of the light-emitting units206 b in portion 70 b, which may avoid or reduce the formation of cracksin the step of using the display device 70 to form a curved displaydevice.

It should be noted that the curved display devices formed of the displaydevices of the above embodiments may include technical features whichare the same as or similar to the technical features of the displaydevices of the above embodiments (e.g., the technical features of thelight-emitting units discussed in paragraphs [0093]-[0094], and[0096]-[0097]). These curved display devices are intended to be includedwithin the scope of the present disclosure.

Fifth Embodiment

Fifth Embodiment of the present disclosure also provides some displaydevices which may avoid or reduce the formation of cracks in the step ofusing these display devices to form curved display devices.

Referring to FIG. 7A, a schematic top view of the display device 80according to Fifth Embodiment of the present disclosure is provided.Although only the substrate 800 and the conductive electrodes (orconductive lines) 802 are shown in FIG. 7A for the interest ofsimplicity, one skilled in the art can understand that additional layersand/or components discussed in the above embodiments may also bedisposed in the display device 80. For example, some light-emittingunits or insulating layers may be formed in the display device 80.

For example, the display device 80 can be bent to form a curved displaydevice (e.g., the curved display devices 10 or 10′ shown in FIGS. 1A and1B). As shown in FIG. 7A, the display device 80 can include a portion 80a and a portion 80 b. For example, the portion 80 a can correspond to acurved portion of a curved display device (e.g., the curved portion 100′of the curved display device 10′ illustrated in FIG. 1B) formed of thedisplay device 80, and the portion 80 b can correspond to a non-curvedportion of the curved display device formed of the display device 80.

As shown in FIG. 7A, the conductive electrode (or conductive line) 802can include a neck portion 802 a disposed in the portion 80 a of thedisplay device 80, and a portion 802 b disposed in the portion 80 b ofthe display device 80. For example, the portion 802 a is narrower thanthe other portions of the conductive electrode (or conductive line) 802.In some embodiments, a width W₂ of the portion 802 a of the conductiveelectrode (or conductive line) 802 is smaller than a width W₁ of theportion 802 b of the conductive electrode (or conductive line) 802,which may avoid or reduce the formation of cracks in the step of usingthe display device 80 to form a curved display device.

In some embodiments, as shown in FIG. 7B, the conductive electrode (orconductive line) 802 can include one or more openings 804. The density(e.g., number of openings per unit area) of the openings 804 in theportion 802 a of the conductive electrode (or conductive line) 802 andthe density of the openings 804 in the portion 802 b of the conductiveelectrode (or conductive line) 802 may be different. For example, thedensity of the openings 804 in the portion 802 a of the conductiveelectrode (or conductive line) 802 may be greater than the density ofthe openings 804 in the portion 802 b of the conductive electrode (orconductive line) 802, which may avoid or reduce the formation of cracksin the step of using the display device 80 to form a curved displaydevice.

In some embodiments, as shown in FIG. 7C, the area of one of theopenings 804 in the portion 802 a of the conductive electrode 802 andthe area of one of the openings 804 in the portion 802 b of theconductive electrode (or conductive line) 802 may be different. Forexample, the area of one of the openings 804 in the portion 802 a of theconductive electrode (or conductive line) 802 may be greater than thearea of one of the openings 804 in the portion 802 b of the conductiveelectrode (or conductive line) 802, which may avoid or reduce theformation of cracks in the step of using the display device 80 to form acurved display device.

It should be noted that the curved display devices formed of the displaydevices of the above embodiments may include technical features whichare the same as or similar to the technical features of the displaydevices of the above embodiments (e.g., the technical features of theconductive electrodes discussed in paragraphs [00103]-[00105]). Thesecurved display devices are intended to be included within the scope ofthe present disclosure.

Understandably, a deposition process, a lithography process, an etchingprocess, other applicable processes, or a combination thereof may beused to form the display devices of the above embodiments.

The foregoing outlines features of several embodiments so that thoseskilled in the art may better understand the aspects of the presentdisclosure. Those skilled in the art should appreciate that they mayreadily use the present disclosure as a basis for designing or modifyingother processes and structures for carrying out the same purposes and/orachieving the same advantages of the embodiments introduced herein.Those skilled in the art should also realize that such equivalentconstructions do not depart from the spirit and scope of the presentdisclosure, and that they may make various changes, substitutions, andalterations herein without departing from the spirit and scope of thepresent disclosure. In addition, each claim can be an individualembodiment of the present disclosure, and the scope of the presentdisclosure includes the combinations of every claim and every embodimentof the present disclosure.

What is claimed is:
 1. A display device, comprising: a substrate havinga first edge and a second edge opposite to the first edge, wherein afirst distance is between the first edge and the second edge; aplurality of light-emitting units disposed on the substrate; and aconductive line disposed on the substrate and electrically connected toat least one of the plurality of light-emitting units, wherein theconductive line includes an undulating edge, wherein the conductive linehas an extending length, and wherein the extending length is greaterthan or equal to half of the first distance and is less than or equal tothe first distance.
 2. The display device according to claim 1, whereinthe conductive line further includes a plurality of openings.
 3. Thedisplay device according to claim 1, further comprising: a conductiveelectrode disposed on the substrate, wherein the conductive line iselectrically connected to at least one of the plurality oflight-emitting units by the conductive electrode, and the conductiveelectrode includes an undulating edge.
 4. The display device accordingto claim 3, wherein the conductive electrode further includes aplurality of openings.
 5. The display device according to claim 4,wherein an area of one of the plurality of openings is smaller than anarea of one of the plurality of light-emitting units.
 6. The displaydevice according to claim 3, wherein the conductive electrode comprisesa common electrode, a touch electrode, or a combination thereof.
 7. Thedisplay device according to claim 3, further comprising: a touchelectrode disposed on the conductive electrode, wherein the touchelectrode includes an undulating edge.
 8. The display device accordingto claim 7, wherein the touch electrode further includes a plurality ofopenings.
 9. The display device according to claim 1, furthercomprising: a conductive electrode disposed on the substrate, whereinthe conductive line is electrically connected to at least one of theplurality of light-emitting units by the conductive electrode, theconductive electrode includes a plurality of openings, at least one ofthe plurality of openings has a shape, and the shape has a first curvedportion.
 10. The display device according to claim 1, furthercomprising: an insulating layer disposed on the substrate; and aconductive electrode disposed on the insulating layer, wherein theinsulating layer includes a first portion and a second portion adjacentto the first portion, the first portion and the conductive electrode areoverlapping, the second portion and the conductive electrode are notoverlapping, and a thickness of the second portion is greater than athickness of the first portion.
 11. The display device according toclaim 1, further comprising: an insulating layer disposed on thesubstrate, wherein the conductive line is disposed on the insulatinglayer, the insulating layer includes a first portion and a secondportion adjacent to the first portion, the first portion and theconductive line are overlapping, the second portion and the conductiveline are not overlapping, and a thickness of the first portion isgreater than a thickness of the second portion.
 12. The display deviceaccording to claim 1, wherein the light-emitting unit is alight-emitting diode.
 13. A display device, comprising: a substrate; aplurality of light-emitting units disposed on the substrate; and aconductive line disposed on the substrate and electrically connected toat least one of the plurality of light-emitting units, wherein theconductive line includes a plurality of openings.
 14. The display deviceaccording to claim 13, further comprising: a conductive electrodedisposed on the substrate, wherein the conductive line is electricallyconnected to at least one of the plurality of light-emitting units bythe conductive electrode, and the conductive electrode includes anundulating edge.
 15. The display device according to claim 13, furthercomprising: a conductive electrode disposed on the substrate, whereinthe conductive line is electrically connected to at least one of theplurality of light-emitting units by the conductive electrode, and theconductive electrode includes a plurality of openings.
 16. The methodaccording to claim 15, wherein an area of one of the plurality ofopenings of the conductive electrode is smaller than an area of one ofthe plurality of light-emitting units.
 17. The display device accordingto claim 13, wherein the conductive line further includes an undulatingedge.
 18. The display device according to claim 13, wherein theconductive electrode comprises a common electrode, a touch electrode, ora combination thereof.
 19. The display device according to claim 13,further comprising: an insulating layer disposed on the substrate; and aconductive electrode disposed on the insulating layer, wherein theinsulating layer includes a first portion and a second portion adjacentto the first portion, the first portion and the conductive electrode areoverlapping, the second portion and the conductive electrode are notoverlapping, and a thickness of the second portion is greater than athickness of the first portion.
 20. The display device according toclaim 13, wherein the light-emitting unit is a light-emitting diode.